When the ninth of Av falls on Shabbat, the fast is postponed until Sunday. Have Chazal canceled the fast of the ninth of Av and instituted it instead on the tenth, or is the day of the ninth still the day of mourning in principle?

The beraita (Ta’anit 30a) teaches that “all the restrictions that apply to the mourner apply on Tisha Be-Av; eating, drinking, bathing, anointing, the wearing of shoes and marital relations, are forbidden thereon.”

The gemara in Ta’anit (30a) cites a baraita that details the prohibitions of Tisha Be-Av. The baraita compares these prohibitions to those that a mourner observes following the loss of a close relative.

This year, the ninth of Av falls on Shabbat. Since it is prohibited to fast on Shabbat, the fast is pushed off until Sunday, the tenth of Av. However, there are many things prohibited on Tisha Be-Av aside from fasting, and it is usually permissible to refrain from these things on Shabbat. Do these laws apply on Shabbat, despite the fact that the fast is delayed?